Method for producing graphene

a graphene and graphene oxide technology, applied in the direction of single-layer graphene, magnetic separation, grain treatment, etc., can solve the problem that the method cannot separate only the single-layer graphene oxide from the mixture of graphene oxides having different numbers of layers

Active Publication Date: 2017-10-31
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Benefits of technology

[0015]The present invention enables separating a single-layer graphene, or graphenes with the desired numbers of layers from a mixed state of graphenes having different numbers of layers.

Problems solved by technology

A problem of the conventional chemical exfoliation method in which a graphite powder is oxidized and exfoliated by ultrasonic waves, and that uses centrifugation for the separation of graphene oxide, then, is that the method cannot separate only the single-layer graphene oxide from a mixture of graphene oxides having different numbers of layers.

Method used

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Embodiment Construction

[0030]An embodiment of the present invention is described below with reference to the accompanying drawings.

(Graphite)

[0031]Graphite is a material with a layered structure, with planar layers of carbon atoms arranged in a hexagonal lattice that resembles the scutes of a turtle and laminated.

[0032]Various types of graphite are known, including natural graphite occurring as minerals, thin-film graphite produced by CVD, and high crystallinity graphite produced by high heat treatment of an organic film (crystalline graphite).

[0033]High crystallinity graphite shows a (002) peak half bandwidth of 0.1° or less in X-ray diffractometry. It appears that high crystallinity graphite, with its large crystal sizes, tends to break the weak Van der Waals' bonds connecting the layers in the graphite, and helps remove large graphene particles.

[0034]It would also appear that use of high crystallinity graphite improves the electrical and thermal properties of graphene because high crystallinity graphit...

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Abstract

A dispersion of suspended single-layer graphene, multilayer graphene, and graphite is used. A magnetic field is applied to the dispersion to separate the single-layer graphene from the dispersion. By applying the magnetic field, the single-layer graphene, the multilayer graphene, and the graphite are situated at different locations in solvent by the difference in the diamagnetism strengths of the single-layer graphene, the multilayer graphene, and the graphite.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a U.S. national stage application of PCT International Application No. PCT / JP2013 / 003299 filed on May 24, 2013, and claims the benefit of foreign priority to Japanese patent application 2012-122723 filed on May 30, 2012, the contents all of which are incorporated by reference.TECHNICAL FIELD[0002]The present invention relates to a graphene producing method applicable to transparent electrodes, battery electrodes, and semiconductor devices.BACKGROUND ART[0003]Graphene is a material with a single layer of graphite crystals, and has attracted interest as a material with very unique physical properties. Among such unique attractive physical properties of graphene are high electrical mobility, high heat conductivity, high strength, and high light transmissivity. Such unique physical properties should be useful for providing novel electronics devices and nanotechnology materials.[0004]Chemical exfoliation (Patent Lite...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B02C23/00B82Y30/00B82Y40/00B02C19/06B03C1/30B02C23/08
CPCC01B32/20B03C1/30B02C19/06B02C23/08B82Y30/00C01B32/184C01B32/19B82Y40/00B02C23/00B03C2201/18C01B2204/02C01B32/21
Inventor KITAURA, HIDETOSHINISHIKI, NAOMINISHIKAWA, KAZUHIRONAKAYA, KIMIAKITANAKA, ATSUSHI
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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